So what are biological kingdoms?
We are not talking royalty here.
But they are pretty important in grouping or classifying organisms, and understanding how they are related.
You can learn more about what "classification" is in the Classifying Organisms video.
Classification attempts to impose a hierarchy on a complex and dynamic variety of life on Earth
by describing how different species group together, and how related they are to one another or not.
Kingdom is the second [...] below the rank of Domain in the sequence of classification.
Remember that little rhyme from the Classifying Organisms video?
Do Keep Ponds Clean Or Frogs Get Sick.
Or you might prefer this one
Definitely Keep Plucking Chickens Or Face Getting Sacked.